[media] vb2: stop_streaming should return void

The vb2 core ignores any return code from the stop_streaming op.
And there really isn't anything it can do anyway in case of an error.
So change the return type to void and update any drivers that implement it.

The int return gave drivers the idea that this operation could actually
fail, but that's really not the case.

The pwc amd sdr-msi3101 drivers both had this construction:

        if (mutex_lock_interruptible(&s->v4l2_lock))
                return -ERESTARTSYS;

This has been updated to just call mutex_lock(). The stop_streaming op
expects this to really stop streaming and I very much doubt this will
work reliably if stop_streaming just returns without really stopping the
DMA.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

Documentation/video4linux/v4l2-pci-skeleton.c

@@ -269,7 +269,7 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
  * Stop the DMA engine. Any remaining buffers in the DMA queue are dequeued
  * and passed on to the vb2 framework marked as STATE_ERROR.
  */
-static int stop_streaming(struct vb2_queue *vq)
+static void stop_streaming(struct vb2_queue *vq)
 {
 	struct skeleton *skel = vb2_get_drv_priv(vq);
 
@@ -277,7 +277,6 @@ static int stop_streaming(struct vb2_queue *vq)
 
 	/* Release all active buffers */
 	return_all_buffers(skel, VB2_BUF_STATE_ERROR);
-	return 0;
 }
 
 /*

drivers/media/pci/sta2x11/sta2x11_vip.c

@@ -357,7 +357,7 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
 }
 
 /* abort streaming and wait for last buffer */
-static int stop_streaming(struct vb2_queue *vq)
+static void stop_streaming(struct vb2_queue *vq)
 {
 	struct sta2x11_vip *vip = vb2_get_drv_priv(vq);
 	struct vip_buffer *vip_buf, *node;
@@ -374,7 +374,6 @@ static int stop_streaming(struct vb2_queue *vq)
 		list_del(&vip_buf->list);
 	}
 	spin_unlock(&vip->lock);
-	return 0;
 }
 
 static struct vb2_ops vip_video_qops = {

drivers/media/platform/blackfin/bfin_capture.c

@@ -427,7 +427,7 @@ static int bcap_start_streaming(struct vb2_queue *vq, unsigned int count)
 	return 0;
 }
 
-static int bcap_stop_streaming(struct vb2_queue *vq)
+static void bcap_stop_streaming(struct vb2_queue *vq)
 {
 	struct bcap_device *bcap_dev = vb2_get_drv_priv(vq);
 	struct ppi_if *ppi = bcap_dev->ppi;
@@ -452,7 +452,6 @@ static int bcap_stop_streaming(struct vb2_queue *vq)
 		list_del(&bcap_dev->cur_frm->list);
 		vb2_buffer_done(&bcap_dev->cur_frm->vb, VB2_BUF_STATE_ERROR);
 	}
-	return 0;
 }
 
 static struct vb2_ops bcap_video_qops = {

drivers/media/platform/coda.c

@@ -2269,7 +2269,7 @@ out:
 	return ret;
 }
 
-static int coda_stop_streaming(struct vb2_queue *q)
+static void coda_stop_streaming(struct vb2_queue *q)
 {
 	struct coda_ctx *ctx = vb2_get_drv_priv(q);
 	struct coda_dev *dev = ctx->dev;
@@ -2295,8 +2295,6 @@ static int coda_stop_streaming(struct vb2_queue *q)
 			ctx->bitstream.vaddr, ctx->bitstream.size);
 		ctx->runcounter = 0;
 	}
-
-	return 0;
 }
 
 static struct vb2_ops coda_qops = {

drivers/media/platform/davinci/vpbe_display.c

@@ -368,7 +368,7 @@ static int vpbe_start_streaming(struct vb2_queue *vq, unsigned int count)
 	return ret;
 }
 
-static int vpbe_stop_streaming(struct vb2_queue *vq)
+static void vpbe_stop_streaming(struct vb2_queue *vq)
 {
 	struct vpbe_fh *fh = vb2_get_drv_priv(vq);
 	struct vpbe_layer *layer = fh->layer;
@@ -376,7 +376,7 @@ static int vpbe_stop_streaming(struct vb2_queue *vq)
 	unsigned long flags;
 
 	if (!vb2_is_streaming(vq))
-		return 0;
+		return;
 
 	/* release all active buffers */
 	spin_lock_irqsave(&disp->dma_queue_lock, flags);
@@ -398,7 +398,6 @@ static int vpbe_stop_streaming(struct vb2_queue *vq)
 		vb2_buffer_done(&layer->next_frm->vb, VB2_BUF_STATE_ERROR);
 	}
 	spin_unlock_irqrestore(&disp->dma_queue_lock, flags);
-	return 0;
 }
 
 static struct vb2_ops video_qops = {

drivers/media/platform/davinci/vpif_capture.c

@@ -346,7 +346,7 @@ static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count)
 }
 
 /* abort streaming and wait for last buffer */
-static int vpif_stop_streaming(struct vb2_queue *vq)
+static void vpif_stop_streaming(struct vb2_queue *vq)
 {
 	struct vpif_fh *fh = vb2_get_drv_priv(vq);
 	struct channel_obj *ch = fh->channel;
@@ -354,7 +354,7 @@ static int vpif_stop_streaming(struct vb2_queue *vq)
 	unsigned long flags;
 
 	if (!vb2_is_streaming(vq))
-		return 0;
+		return;
 
 	common = &ch->common[VPIF_VIDEO_INDEX];
 
@@ -390,8 +390,6 @@ static int vpif_stop_streaming(struct vb2_queue *vq)
 		vb2_buffer_done(&common->next_frm->vb, VB2_BUF_STATE_ERROR);
 	}
 	spin_unlock_irqrestore(&common->irqlock, flags);
-
-	return 0;
 }
 
 static struct vb2_ops video_qops = {

drivers/media/platform/davinci/vpif_display.c

@@ -308,7 +308,7 @@ static int vpif_start_streaming(struct vb2_queue *vq, unsigned int count)
 }
 
 /* abort streaming and wait for last buffer */
-static int vpif_stop_streaming(struct vb2_queue *vq)
+static void vpif_stop_streaming(struct vb2_queue *vq)
 {
 	struct vpif_fh *fh = vb2_get_drv_priv(vq);
 	struct channel_obj *ch = fh->channel;
@@ -316,7 +316,7 @@ static int vpif_stop_streaming(struct vb2_queue *vq)
 	unsigned long flags;
 
 	if (!vb2_is_streaming(vq))
-		return 0;
+		return;
 
 	common = &ch->common[VPIF_VIDEO_INDEX];
 
@@ -352,8 +352,6 @@ static int vpif_stop_streaming(struct vb2_queue *vq)
 		vb2_buffer_done(&common->next_frm->vb, VB2_BUF_STATE_ERROR);
 	}
 	spin_unlock_irqrestore(&common->irqlock, flags);
-
-	return 0;
 }
 
 static struct vb2_ops video_qops = {

drivers/media/platform/exynos-gsc/gsc-m2m.c

@@ -66,15 +66,13 @@ static int gsc_m2m_start_streaming(struct vb2_queue *q, unsigned int count)
 	return ret > 0 ? 0 : ret;
 }
 
-static int gsc_m2m_stop_streaming(struct vb2_queue *q)
+static void gsc_m2m_stop_streaming(struct vb2_queue *q)
 {
 	struct gsc_ctx *ctx = q->drv_priv;
 
 	__gsc_m2m_job_abort(ctx);
 
 	pm_runtime_put(&ctx->gsc_dev->pdev->dev);
-
-	return 0;
 }
 
 void gsc_m2m_job_finish(struct gsc_ctx *ctx, int vb_state)

drivers/media/platform/exynos4-is/fimc-capture.c

@@ -294,15 +294,15 @@ static int start_streaming(struct vb2_queue *q, unsigned int count)
 	return 0;
 }
 
-static int stop_streaming(struct vb2_queue *q)
+static void stop_streaming(struct vb2_queue *q)
 {
 	struct fimc_ctx *ctx = q->drv_priv;
 	struct fimc_dev *fimc = ctx->fimc_dev;
 
 	if (!fimc_capture_active(fimc))
-		return -EINVAL;
+		return;
 
-	return fimc_stop_capture(fimc, false);
+	fimc_stop_capture(fimc, false);
 }
 
 int fimc_capture_suspend(struct fimc_dev *fimc)

drivers/media/platform/exynos4-is/fimc-isp-video.c

@@ -125,7 +125,7 @@ static int isp_video_capture_start_streaming(struct vb2_queue *q,
 	return ret;
 }
 
-static int isp_video_capture_stop_streaming(struct vb2_queue *q)
+static void isp_video_capture_stop_streaming(struct vb2_queue *q)
 {
 	struct fimc_isp *isp = vb2_get_drv_priv(q);
 	struct fimc_is *is = fimc_isp_to_is(isp);
@@ -134,7 +134,7 @@ static int isp_video_capture_stop_streaming(struct vb2_queue *q)
 
 	ret = fimc_pipeline_call(&isp->video_capture.ve, set_stream, 0);
 	if (ret < 0)
-		return ret;
+		return;
 
 	dma->cmd = DMA_OUTPUT_COMMAND_DISABLE;
 	dma->notify_dma_done = DMA_OUTPUT_NOTIFY_DMA_DONE_DISABLE;
@@ -155,7 +155,6 @@ static int isp_video_capture_stop_streaming(struct vb2_queue *q)
 	clear_bit(ST_ISP_VID_CAP_STREAMING, &isp->state);
 
 	isp->video_capture.buf_count = 0;
-	return 0;
 }
 
 static int isp_video_capture_buffer_prepare(struct vb2_buffer *vb)

drivers/media/platform/exynos4-is/fimc-lite.c

@@ -350,14 +350,14 @@ static int start_streaming(struct vb2_queue *q, unsigned int count)
 	return 0;
 }
 
-static int stop_streaming(struct vb2_queue *q)
+static void stop_streaming(struct vb2_queue *q)
 {
 	struct fimc_lite *fimc = q->drv_priv;
 
 	if (!fimc_lite_active(fimc))
-		return -EINVAL;
+		return;
 
-	return fimc_lite_stop_capture(fimc, false);
+	fimc_lite_stop_capture(fimc, false);
 }
 
 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *pfmt,

drivers/media/platform/exynos4-is/fimc-m2m.c

@@ -85,7 +85,7 @@ static int start_streaming(struct vb2_queue *q, unsigned int count)
 	return ret > 0 ? 0 : ret;
 }
 
-static int stop_streaming(struct vb2_queue *q)
+static void stop_streaming(struct vb2_queue *q)
 {
 	struct fimc_ctx *ctx = q->drv_priv;
 	int ret;
@@ -95,7 +95,6 @@ static int stop_streaming(struct vb2_queue *q)
 		fimc_m2m_job_finish(ctx, VB2_BUF_STATE_ERROR);
 
 	pm_runtime_put(&ctx->fimc_dev->pdev->dev);
-	return 0;
 }
 
 static void fimc_device_run(void *priv)

drivers/media/platform/marvell-ccic/mcam-core.c

@@ -1156,7 +1156,7 @@ static int mcam_vb_start_streaming(struct vb2_queue *vq, unsigned int count)
 	return mcam_read_setup(cam);
 }
 
-static int mcam_vb_stop_streaming(struct vb2_queue *vq)
+static void mcam_vb_stop_streaming(struct vb2_queue *vq)
 {
 	struct mcam_camera *cam = vb2_get_drv_priv(vq);
 	unsigned long flags;
@@ -1164,10 +1164,10 @@ static int mcam_vb_stop_streaming(struct vb2_queue *vq)
 	if (cam->state == S_BUFWAIT) {
 		/* They never gave us buffers */
 		cam->state = S_IDLE;
-		return 0;
+		return;
 	}
 	if (cam->state != S_STREAMING)
-		return -EINVAL;
+		return;
 	mcam_ctlr_stop_dma(cam);
 	/*
 	 * Reset the CCIC PHY after stopping streaming,
@@ -1182,7 +1182,6 @@ static int mcam_vb_stop_streaming(struct vb2_queue *vq)
 	spin_lock_irqsave(&cam->dev_lock, flags);
 	INIT_LIST_HEAD(&cam->buffers);
 	spin_unlock_irqrestore(&cam->dev_lock, flags);
-	return 0;
 }
 
 

drivers/media/platform/mem2mem_testdev.c

@@ -787,7 +787,7 @@ static int m2mtest_start_streaming(struct vb2_queue *q, unsigned count)
 	return 0;
 }
 
-static int m2mtest_stop_streaming(struct vb2_queue *q)
+static void m2mtest_stop_streaming(struct vb2_queue *q)
 {
 	struct m2mtest_ctx *ctx = vb2_get_drv_priv(q);
 	struct vb2_buffer *vb;
@@ -799,12 +799,11 @@ static int m2mtest_stop_streaming(struct vb2_queue *q)
 		else
 			vb = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
 		if (vb == NULL)
-			return 0;
+			return;
 		spin_lock_irqsave(&ctx->dev->irqlock, flags);
 		v4l2_m2m_buf_done(vb, VB2_BUF_STATE_ERROR);
 		spin_unlock_irqrestore(&ctx->dev->irqlock, flags);
 	}
-	return 0;
 }
 
 static struct vb2_ops m2mtest_qops = {

drivers/media/platform/s3c-camif/camif-capture.c

@@ -435,10 +435,10 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
 	return 0;
 }
 
-static int stop_streaming(struct vb2_queue *vq)
+static void stop_streaming(struct vb2_queue *vq)
 {
 	struct camif_vp *vp = vb2_get_drv_priv(vq);
-	return camif_stop_capture(vp);
+	camif_stop_capture(vp);
 }
 
 static int queue_setup(struct vb2_queue *vq, const struct v4l2_format *pfmt,

drivers/media/platform/s5p-jpeg/jpeg-core.c

@@ -1670,13 +1670,11 @@ static int s5p_jpeg_start_streaming(struct vb2_queue *q, unsigned int count)
 	return ret > 0 ? 0 : ret;
 }
 
-static int s5p_jpeg_stop_streaming(struct vb2_queue *q)
+static void s5p_jpeg_stop_streaming(struct vb2_queue *q)
 {
 	struct s5p_jpeg_ctx *ctx = vb2_get_drv_priv(q);
 
 	pm_runtime_put(ctx->jpeg->dev);
-
-	return 0;
 }
 
 static struct vb2_ops s5p_jpeg_qops = {

drivers/media/platform/s5p-mfc/s5p_mfc_dec.c

@@ -1027,7 +1027,7 @@ static int s5p_mfc_start_streaming(struct vb2_queue *q, unsigned int count)
 	return 0;
 }
 
-static int s5p_mfc_stop_streaming(struct vb2_queue *q)
+static void s5p_mfc_stop_streaming(struct vb2_queue *q)
 {
 	unsigned long flags;
 	struct s5p_mfc_ctx *ctx = fh_to_ctx(q->drv_priv);
@@ -1071,7 +1071,6 @@ static int s5p_mfc_stop_streaming(struct vb2_queue *q)
 	}
 	if (aborted)
 		ctx->state = MFCINST_RUNNING;
-	return 0;
 }
 
 

drivers/media/platform/s5p-mfc/s5p_mfc_enc.c

@@ -1954,7 +1954,7 @@ static int s5p_mfc_start_streaming(struct vb2_queue *q, unsigned int count)
 	return 0;
 }
 
-static int s5p_mfc_stop_streaming(struct vb2_queue *q)
+static void s5p_mfc_stop_streaming(struct vb2_queue *q)
 {
 	unsigned long flags;
 	struct s5p_mfc_ctx *ctx = fh_to_ctx(q->drv_priv);
@@ -1983,7 +1983,6 @@ static int s5p_mfc_stop_streaming(struct vb2_queue *q)
 		ctx->src_queue_cnt = 0;
 	}
 	spin_unlock_irqrestore(&dev->irqlock, flags);
-	return 0;
 }
 
 static void s5p_mfc_buf_queue(struct vb2_buffer *vb)

drivers/media/platform/s5p-tv/mixer_video.c

@@ -985,7 +985,7 @@ static void mxr_watchdog(unsigned long arg)
 	spin_unlock_irqrestore(&layer->enq_slock, flags);
 }
 
-static int stop_streaming(struct vb2_queue *vq)
+static void stop_streaming(struct vb2_queue *vq)
 {
 	struct mxr_layer *layer = vb2_get_drv_priv(vq);
 	struct mxr_device *mdev = layer->mdev;
@@ -1031,7 +1031,6 @@ static int stop_streaming(struct vb2_queue *vq)
 	mxr_streamer_put(mdev);
 	/* allow changes in output configuration */
 	mxr_output_put(mdev);
-	return 0;
 }
 
 static struct vb2_ops mxr_video_qops = {

drivers/media/platform/soc_camera/atmel-isi.c

@@ -406,7 +406,7 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
 }
 
 /* abort streaming and wait for last buffer */
-static int stop_streaming(struct vb2_queue *vq)
+static void stop_streaming(struct vb2_queue *vq)
 {
 	struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
 	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
@@ -433,7 +433,7 @@ static int stop_streaming(struct vb2_queue *vq)
 	if (time_after(jiffies, timeout)) {
 		dev_err(icd->parent,
 			"Timeout waiting for finishing codec request\n");
-		return -ETIMEDOUT;
+		return;
 	}
 
 	/* Disable interrupts */
@@ -444,8 +444,6 @@ static int stop_streaming(struct vb2_queue *vq)
 	ret = atmel_isi_wait_status(isi, WAIT_ISI_DISABLE);
 	if (ret < 0)
 		dev_err(icd->parent, "Disable ISI timed out\n");
-
-	return ret;
 }
 
 static struct vb2_ops isi_video_qops = {

drivers/media/platform/soc_camera/mx2_camera.c

@@ -741,7 +741,7 @@ static int mx2_start_streaming(struct vb2_queue *q, unsigned int count)
 	return 0;
 }
 
-static int mx2_stop_streaming(struct vb2_queue *q)
+static void mx2_stop_streaming(struct vb2_queue *q)
 {
 	struct soc_camera_device *icd = soc_camera_from_vb2q(q);
 	struct soc_camera_host *ici =
@@ -773,8 +773,6 @@ static int mx2_stop_streaming(struct vb2_queue *q)
 
 	dma_free_coherent(ici->v4l2_dev.dev,
 			  pcdev->discard_size, b, pcdev->discard_buffer_dma);
-
-	return 0;
 }
 
 static struct vb2_ops mx2_videobuf_ops = {

drivers/media/platform/soc_camera/mx3_camera.c

@@ -406,7 +406,7 @@ static int mx3_videobuf_init(struct vb2_buffer *vb)
 	return 0;
 }
 
-static int mx3_stop_streaming(struct vb2_queue *q)
+static void mx3_stop_streaming(struct vb2_queue *q)
 {
 	struct soc_camera_device *icd = soc_camera_from_vb2q(q);
 	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
@@ -430,8 +430,6 @@ static int mx3_stop_streaming(struct vb2_queue *q)
 	}
 
 	spin_unlock_irqrestore(&mx3_cam->lock, flags);
-
-	return 0;
 }
 
 static struct vb2_ops mx3_videobuf_ops = {

drivers/media/platform/soc_camera/rcar_vin.c

@@ -513,7 +513,7 @@ static int rcar_vin_videobuf_init(struct vb2_buffer *vb)
 	return 0;
 }
 
-static int rcar_vin_stop_streaming(struct vb2_queue *vq)
+static void rcar_vin_stop_streaming(struct vb2_queue *vq)
 {
 	struct soc_camera_device *icd = soc_camera_from_vb2q(vq);
 	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
@@ -524,8 +524,6 @@ static int rcar_vin_stop_streaming(struct vb2_queue *vq)
 	list_for_each_safe(buf_head, tmp, &priv->capture)
 		list_del_init(buf_head);
 	spin_unlock_irq(&priv->lock);
-
-	return 0;
 }
 
 static struct vb2_ops rcar_vin_vb2_ops = {

drivers/media/platform/soc_camera/sh_mobile_ceu_camera.c

@@ -471,7 +471,7 @@ static int sh_mobile_ceu_videobuf_init(struct vb2_buffer *vb)
 	return 0;
 }
 
-static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
+static void sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
 {
 	struct soc_camera_device *icd = container_of(q, struct soc_camera_device, vb2_vidq);
 	struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
@@ -487,7 +487,7 @@ static int sh_mobile_ceu_stop_streaming(struct vb2_queue *q)
 
 	spin_unlock_irq(&pcdev->lock);
 
-	return sh_mobile_ceu_soft_reset(pcdev);
+	sh_mobile_ceu_soft_reset(pcdev);
 }
 
 static struct vb2_ops sh_mobile_ceu_videobuf_ops = {

drivers/media/platform/vivi.c

@@ -906,12 +906,11 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
 }
 
 /* abort streaming and wait for last buffer */
-static int stop_streaming(struct vb2_queue *vq)
+static void stop_streaming(struct vb2_queue *vq)
 {
 	struct vivi_dev *dev = vb2_get_drv_priv(vq);
 	dprintk(dev, 1, "%s\n", __func__);
 	vivi_stop_generating(dev);
-	return 0;
 }
 
 static void vivi_lock(struct vb2_queue *vq)

drivers/media/platform/vsp1/vsp1_video.c

@@ -720,7 +720,7 @@ static int vsp1_video_start_streaming(struct vb2_queue *vq, unsigned int count)
 	return 0;
 }
 
-static int vsp1_video_stop_streaming(struct vb2_queue *vq)
+static void vsp1_video_stop_streaming(struct vb2_queue *vq)
 {
 	struct vsp1_video *video = vb2_get_drv_priv(vq);
 	struct vsp1_pipeline *pipe = to_vsp1_pipeline(&video->video.entity);
@@ -743,8 +743,6 @@ static int vsp1_video_stop_streaming(struct vb2_queue *vq)
 	spin_lock_irqsave(&video->irqlock, flags);
 	INIT_LIST_HEAD(&video->irqqueue);
 	spin_unlock_irqrestore(&video->irqlock, flags);
-
-	return 0;
 }
 
 static struct vb2_ops vsp1_video_queue_qops = {

drivers/media/usb/em28xx/em28xx-v4l.h

@@ -16,5 +16,5 @@
 
 
 int em28xx_start_analog_streaming(struct vb2_queue *vq, unsigned int count);
-int em28xx_stop_vbi_streaming(struct vb2_queue *vq);
+void em28xx_stop_vbi_streaming(struct vb2_queue *vq);
 extern struct vb2_ops em28xx_vbi_qops;

drivers/media/usb/em28xx/em28xx-video.c

@@ -937,7 +937,7 @@ int em28xx_start_analog_streaming(struct vb2_queue *vq, unsigned int count)
 	return rc;
 }
 
-static int em28xx_stop_streaming(struct vb2_queue *vq)
+static void em28xx_stop_streaming(struct vb2_queue *vq)
 {
 	struct em28xx *dev = vb2_get_drv_priv(vq);
 	struct em28xx_dmaqueue *vidq = &dev->vidq;
@@ -961,11 +961,9 @@ static int em28xx_stop_streaming(struct vb2_queue *vq)
 	}
 	dev->usb_ctl.vid_buf = NULL;
 	spin_unlock_irqrestore(&dev->slock, flags);
-
-	return 0;
 }
 
-int em28xx_stop_vbi_streaming(struct vb2_queue *vq)
+void em28xx_stop_vbi_streaming(struct vb2_queue *vq)
 {
 	struct em28xx *dev = vb2_get_drv_priv(vq);
 	struct em28xx_dmaqueue *vbiq = &dev->vbiq;
@@ -989,8 +987,6 @@ int em28xx_stop_vbi_streaming(struct vb2_queue *vq)
 	}
 	dev->usb_ctl.vbi_buf = NULL;
 	spin_unlock_irqrestore(&dev->slock, flags);
-
-	return 0;
 }
 
 static void

drivers/media/usb/pwc/pwc-if.c

@@ -681,12 +681,11 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
 	return r;
 }
 
-static int stop_streaming(struct vb2_queue *vq)
+static void stop_streaming(struct vb2_queue *vq)
 {
 	struct pwc_device *pdev = vb2_get_drv_priv(vq);
 
-	if (mutex_lock_interruptible(&pdev->v4l2_lock))
-		return -ERESTARTSYS;
+	mutex_lock(&pdev->v4l2_lock);
 	if (pdev->udev) {
 		pwc_set_leds(pdev, 0, 0);
 		pwc_camera_power(pdev, 0);
@@ -695,8 +694,6 @@ static int stop_streaming(struct vb2_queue *vq)
 
 	pwc_cleanup_queued_bufs(pdev);
 	mutex_unlock(&pdev->v4l2_lock);
-
-	return 0;
 }
 
 static struct vb2_ops pwc_vb_queue_ops = {

drivers/media/usb/s2255/s2255drv.c

@@ -714,7 +714,7 @@ static void buffer_queue(struct vb2_buffer *vb)
 }
 
 static int start_streaming(struct vb2_queue *vq, unsigned int count);
-static int stop_streaming(struct vb2_queue *vq);
+static void stop_streaming(struct vb2_queue *vq);
 
 static struct vb2_ops s2255_video_qops = {
 	.queue_setup = queue_setup,
@@ -1109,7 +1109,7 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
 }
 
 /* abort streaming and wait for last buffer */
-static int stop_streaming(struct vb2_queue *vq)
+static void stop_streaming(struct vb2_queue *vq)
 {
 	struct s2255_vc *vc = vb2_get_drv_priv(vq);
 	struct s2255_buffer *buf, *node;
@@ -1123,7 +1123,6 @@ static int stop_streaming(struct vb2_queue *vq)
 			buf, buf->vb.v4l2_buf.index);
 	}
 	spin_unlock_irqrestore(&vc->qlock, flags);
-	return 0;
 }
 
 static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id i)

drivers/media/usb/stk1160/stk1160-v4l.c

@@ -583,10 +583,10 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
 }
 
 /* abort streaming and wait for last buffer */
-static int stop_streaming(struct vb2_queue *vq)
+static void stop_streaming(struct vb2_queue *vq)
 {
 	struct stk1160 *dev = vb2_get_drv_priv(vq);
-	return stk1160_stop_streaming(dev);
+	stk1160_stop_streaming(dev);
 }
 
 static struct vb2_ops stk1160_video_qops = {

drivers/media/usb/usbtv/usbtv-video.c

@@ -634,15 +634,12 @@ static int usbtv_start_streaming(struct vb2_queue *vq, unsigned int count)
 	return usbtv_start(usbtv);
 }
 
-static int usbtv_stop_streaming(struct vb2_queue *vq)
+static void usbtv_stop_streaming(struct vb2_queue *vq)
 {
 	struct usbtv *usbtv = vb2_get_drv_priv(vq);
 
-	if (usbtv->udev == NULL)
-		return -ENODEV;
-
-	usbtv_stop(usbtv);
-	return 0;
+	if (usbtv->udev)
+		usbtv_stop(usbtv);
 }
 
 static struct vb2_ops usbtv_vb2_ops = {

drivers/media/v4l2-core/videobuf2-core.c

@@ -2086,7 +2086,7 @@ static void __vb2_queue_cancel(struct vb2_queue *q)
 	 * buffers.
 	 */
 	if (q->start_streaming_called)
-		call_qop(q, stop_streaming, q);
+		call_void_qop(q, stop_streaming, q);
 	q->streaming = 0;
 	q->start_streaming_called = 0;
 	q->queued_count = 0;

drivers/staging/media/davinci_vpfe/vpfe_video.c

@@ -1249,7 +1249,7 @@ static int vpfe_buffer_init(struct vb2_buffer *vb)
 }
 
 /* abort streaming and wait for last buffer */
-static int vpfe_stop_streaming(struct vb2_queue *vq)
+static void vpfe_stop_streaming(struct vb2_queue *vq)
 {
 	struct vpfe_fh *fh = vb2_get_drv_priv(vq);
 	struct vpfe_video_device *video = fh->video;
@@ -1272,7 +1272,6 @@ static int vpfe_stop_streaming(struct vb2_queue *vq)
 		list_del(&video->next_frm->list);
 		vb2_buffer_done(&video->next_frm->vb, VB2_BUF_STATE_ERROR);
 	}
-	return 0;
 }
 
 static void vpfe_buf_cleanup(struct vb2_buffer *vb)

drivers/staging/media/dt3155v4l/dt3155v4l.c

@@ -262,7 +262,7 @@ dt3155_buf_prepare(struct vb2_buffer *vb)
 	return 0;
 }
 
-static int
+static void
 dt3155_stop_streaming(struct vb2_queue *q)
 {
 	struct dt3155_priv *pd = vb2_get_drv_priv(q);
@@ -276,7 +276,6 @@ dt3155_stop_streaming(struct vb2_queue *q)
 	}
 	spin_unlock_irq(&pd->lock);
 	msleep(45); /* irq hendler will stop the hardware */
-	return 0;
 }
 
 static void

drivers/staging/media/go7007/go7007-v4l2.c

@@ -516,7 +516,7 @@ static int go7007_start_streaming(struct vb2_queue *q, unsigned int count)
 	return ret;
 }
 
-static int go7007_stop_streaming(struct vb2_queue *q)
+static void go7007_stop_streaming(struct vb2_queue *q)
 {
 	struct go7007 *go = vb2_get_drv_priv(q);
 	unsigned long flags;
@@ -538,7 +538,6 @@ static int go7007_stop_streaming(struct vb2_queue *q)
 	/* Turn on Capture LED */
 	if (go->board_id == GO7007_BOARDID_ADS_USBAV_709)
 		go7007_write_addr(go, 0x3c82, 0x000d);
-	return 0;
 }
 
 static struct vb2_ops go7007_video_qops = {

drivers/staging/media/msi3101/sdr-msi3101.c

@@ -1074,14 +1074,13 @@ static int msi3101_start_streaming(struct vb2_queue *vq, unsigned int count)
 	return ret;
 }
 
-static int msi3101_stop_streaming(struct vb2_queue *vq)
+static void msi3101_stop_streaming(struct vb2_queue *vq)
 {
 	struct msi3101_state *s = vb2_get_drv_priv(vq);
-	int ret;
+
 	dev_dbg(&s->udev->dev, "%s:\n", __func__);
 
-	if (mutex_lock_interruptible(&s->v4l2_lock))
-		return -ERESTARTSYS;
+	mutex_lock(&s->v4l2_lock);
 
 	if (s->udev)
 		msi3101_isoc_cleanup(s);
@@ -1090,22 +1089,15 @@ static int msi3101_stop_streaming(struct vb2_queue *vq)
 
 	/* according to tests, at least 700us delay is required  */
 	msleep(20);
-	ret = msi3101_ctrl_msg(s, CMD_STOP_STREAMING, 0);
-	if (ret)
-		goto err_sleep_tuner;
-
-	/* sleep USB IF / ADC */
-	ret = msi3101_ctrl_msg(s, CMD_WREG, 0x01000003);
-	if (ret)
-		goto err_sleep_tuner;
+	if (!msi3101_ctrl_msg(s, CMD_STOP_STREAMING, 0)) {
+		/* sleep USB IF / ADC */
+		msi3101_ctrl_msg(s, CMD_WREG, 0x01000003);
+	}
 
-err_sleep_tuner:
 	/* sleep tuner */
-	ret = v4l2_subdev_call(s->v4l2_subdev, core, s_power, 0);
+	v4l2_subdev_call(s->v4l2_subdev, core, s_power, 0);
 
 	mutex_unlock(&s->v4l2_lock);
-
-	return ret;
 }
 
 static struct vb2_ops msi3101_vb2_ops = {

drivers/staging/media/rtl2832u_sdr/rtl2832_sdr.c

@@ -1032,13 +1032,12 @@ err:
 	return ret;
 }
 
-static int rtl2832_sdr_stop_streaming(struct vb2_queue *vq)
+static void rtl2832_sdr_stop_streaming(struct vb2_queue *vq)
 {
 	struct rtl2832_sdr_state *s = vb2_get_drv_priv(vq);
 	dev_dbg(&s->udev->dev, "%s:\n", __func__);
 
-	if (mutex_lock_interruptible(&s->v4l2_lock))
-		return -ERESTARTSYS;
+	mutex_lock(&s->v4l2_lock);
 
 	rtl2832_sdr_kill_urbs(s);
 	rtl2832_sdr_free_urbs(s);
@@ -1053,8 +1052,6 @@ static int rtl2832_sdr_stop_streaming(struct vb2_queue *vq)
 		s->d->props->power_ctrl(s->d, 0);
 
 	mutex_unlock(&s->v4l2_lock);
-
-	return 0;
 }
 
 static struct vb2_ops rtl2832_sdr_vb2_ops = {

drivers/staging/media/solo6x10/solo6x10-v4l2-enc.c

@@ -745,14 +745,13 @@ static int solo_enc_start_streaming(struct vb2_queue *q, unsigned int count)
 	return solo_ring_start(solo_enc->solo_dev);
 }
 
-static int solo_enc_stop_streaming(struct vb2_queue *q)
+static void solo_enc_stop_streaming(struct vb2_queue *q)
 {
 	struct solo_enc_dev *solo_enc = vb2_get_drv_priv(q);
 
 	solo_enc_off(solo_enc);
 	INIT_LIST_HEAD(&solo_enc->vidq_active);
 	solo_ring_stop(solo_enc->solo_dev);
-	return 0;
 }
 
 static struct vb2_ops solo_enc_video_qops = {

drivers/staging/media/solo6x10/solo6x10-v4l2.c

@@ -336,13 +336,12 @@ static int solo_start_streaming(struct vb2_queue *q, unsigned int count)
 	return solo_start_thread(solo_dev);
 }
 
-static int solo_stop_streaming(struct vb2_queue *q)
+static void solo_stop_streaming(struct vb2_queue *q)
 {
 	struct solo_dev *solo_dev = vb2_get_drv_priv(q);
 
 	solo_stop_thread(solo_dev);
 	INIT_LIST_HEAD(&solo_dev->vidq_active);
-	return 0;
 }
 
 static void solo_buf_queue(struct vb2_buffer *vb)

include/media/videobuf2-core.h

@@ -324,7 +324,7 @@ struct vb2_ops {
 	void (*buf_cleanup)(struct vb2_buffer *vb);
 
 	int (*start_streaming)(struct vb2_queue *q, unsigned int count);
-	int (*stop_streaming)(struct vb2_queue *q);
+	void (*stop_streaming)(struct vb2_queue *q);
 
 	void (*buf_queue)(struct vb2_buffer *vb);
 };